glibc/sysdeps/hppa/fpu/feholdexcpt.c
Paul Eggert 581c785bf3 Update copyright dates with scripts/update-copyrights
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 7061 files FOO.

I then removed trailing white space from math/tgmath.h,
support/tst-support-open-dev-null-range.c, and
sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following
obscure pre-commit check failure diagnostics from Savannah.  I don't
know why I run into these diagnostics whereas others evidently do not.

remote: *** 912-#endif
remote: *** 913:
remote: *** 914-
remote: *** error: lines with trailing whitespace found
...
remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
2022-01-01 11:40:24 -08:00

53 lines
1.7 KiB
C

/* Store current floating-point environment and clear exceptions.
Copyright (C) 2000-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#include <fenv.h>
#include <string.h>
int
__feholdexcept (fenv_t *envp)
{
union { unsigned long long buf[4]; fenv_t env; } clear;
unsigned long long *bufptr;
/* Store the environment. */
bufptr = clear.buf;
__asm__ (
"fstd %%fr0,0(%1)\n"
: "=m" (clear) : "r" (bufptr) : "%r0");
memcpy (envp, &clear.env, sizeof (fenv_t));
/* Clear exception queues */
memset (clear.env.__exception, 0, sizeof (clear.env.__exception));
/* And set all exceptions to non-stop. */
clear.env.__status_word &= ~FE_ALL_EXCEPT;
/* Now clear all flags */
clear.env.__status_word &= ~(FE_ALL_EXCEPT << 27);
/* Load the new environment. Note: fr0 must load last to enable T-bit. */
__asm__ (
"fldd 0(%0),%%fr0\n"
: : "r" (bufptr), "m" (clear) : "%r0");
return 0;
}
libm_hidden_def (__feholdexcept)
weak_alias (__feholdexcept, feholdexcept)
libm_hidden_weak (feholdexcept)